<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片布局 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="addDialogVisible=true">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              v-for="(item1,i1) in scope.row.children"
              :key="item1.id"
              :class="['bdbottom',i1===0?'bdtop':'','vcenter']"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级权限和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套渲染二级权限 -->
                <el-row
                  v-for="(item2,i2) in item1.children"
                  :key="item2.id"
                  :class="[i2===0?'':'botop','vcenter']"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row,item2.id)"
                    >{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      v-for="(item3,i3) in item2.children"
                      :key="item3.id"
                      type="warning"
                      :class="[i3===0?'':'bdtop']"
                      closable
                      @close="removeRightById(scope.row,item3.id)"
                    >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{scope.row}}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button
              size="mini"
              type="primary"
              icon="el-icon-edit"
              @click="showEditDialog(scope.row.id)"
            >编辑</el-button>
            <el-button
              size="mini"
              type="danger"
              icon="el-icon-delete"
              @click="removeRoleById(scope.row.id)"
            >删除</el-button>
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
            >分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 添加角色对话框 -->
    <el-dialog title="添加角色" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!--内容主体区域  -->
      <el-form :model="addRole" :rules="addRoleRules" ref="addRoleRef" label-width="80px">
        <el-form-item label="角色名" prop="roleName">
          <el-input v-model="addRole.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addRole.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <!--底部区域  -->
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addPowerRole">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改用户的对话框-->
    <el-dialog
      title="修改角色信息"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form :model="editRole" :rules="editRoleRules" ref="editRoleRef" label-width="80px">
        <el-form-item label="角色名" prop="roleName">
          <el-input v-model="editRole.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="editRole.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleInfo">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightslist"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 角色列表
      roleList: [],
      total: 0,
      //   添加角色
      addRole: {
        roleName: '',
        roleDesc: ''
      },
      //   添加表单的校验规则
      addRoleRules: {
        roleName: [
          { required: true, message: '请输入角色名', trigger: 'blur' }
        ],
        roleDesc: [{ required: true, message: '请输入描述', trigger: 'blur' }]
      },
      //   控制添加角色的显示与隐藏
      addDialogVisible: false,
      //   控制修改角色的对话框的显示与隐藏
      editDialogVisible: false,
      // 查询到的角色信息对象
      editRole: {},
      //   修改表单的校验规则对象
      editRoleRules: {
        roleName: [
          { required: true, message: '请输入角色名', trigger: 'blur' }
        ],
        roleDesc: [{ required: true, message: '请输入描述', trigger: 'blur' }]
      },
      //   控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      //   所有权限的数据
      rightslist: [],
      //   树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      //   默认选中的节点ID值数组
      defKeys: [],
      //   即将分配权限的角色id
      roleId: ''
    }
  },
  created() {
    // 获取所有角色
    this.getRolesList()
  },
  methods: {
    //   获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }
      this.roleList = res.data
    },
    // 点击按钮添加角色
    addPowerRole() {
      this.$refs.addRoleRef.validate(async valid => {
        if (!valid) return
        // 校验通过，发起数据请求
        const { data: res } = await this.$http.post('roles', this.addRole)
        if (res.meta.status !== 201) {
          return this.$message.error('添加角色名失败！')
        }
        this.$message.success('添加角色名成功！')
        // 隐藏添加框
        this.addDialogVisible = false
        // 刷新列表
        this.getRolesList()
      })
    },
    // 监听添加角色对话框的关闭
    addDialogClosed() {
      this.$refs.addRoleRef.resetFields()
    },
    // 根据id查询角色
    async showEditDialog(id) {
      const { data: res } = await this.$http.get('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询角色失败！')
      }
      this.editRole = res.data
      this.editDialogVisible = true
    },
    // 监听修改用户对话框的关闭事件
    editDialogClosed() {
      this.$refs.editRoleRef.resetFields()
    },
    // 点击按钮，刷新角色信息
    editRoleInfo() {
      this.$refs.editRoleRef.validate(async valid => {
        if (!valid) return
        // 校验通过发起数据请求
        const { data: res } = await this.$http.put(
          'roles/' + this.editRole.roleId,
          {
            roleName: this.editRole.roleName,
            roleDesc: this.editRole.roleDesc
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('修改角色信息失败！')
        }
        // 隐藏修改角色对话框
        this.editDialogVisible = false
        // 刷新列表
        this.getRolesList()
        this.$message.success('修改角色信息成功')
      })
    },

    // 根据id删除对应角色
    async removeRoleById(id) {
      // 询问角色是否删除文档
      const confirmResult = await this.$confirm(
        '此操作将永久删除该角色, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => {
        return err
      })
      // 如果用户确认了删除，则返回值为字符串 confirm
      // 如果用户取消了删除，则返回值为字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      //   发起请求删除该角色
      const { data: res } = await this.$http.delete('roles/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('删除用户失败！')
      }
      this.$message.success('删除用户成功！')
      // 刷新列表
      this.getRolesList()
    },
    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示用户是否删除
      const confirmResult = await this.$confirm(
        '此操作将永久删除该角色, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)
      // 如果用户确认了删除，则返回值为字符串 confirm
      // 如果用户取消了删除，则返回值为字符串 cancel
      if (confirmResult !== 'confirm') {
        return this.$message.info('已经取消删除')
      }
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }

      //   this.getRolesList() 不建议调用刷新列表的函数，因为会引起页面重新渲染
      role.children = res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据失败')
      }
      // 把获取到的权限数据保存到data
      this.rightslist = res.data

      //   递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下的所有三级权限的id，并保存到defKeys数组中
    getLeafKeys(node, arr) {
      // 如果当前node节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }

      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scope>
.el-tag {
  margin: 8px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>
